Electrical condenser



G. HILL.

ELECTRICAL CONDENSER.

APPLICATION FILED JULY 23,1919.

1 ,408,738, Patented Mar 7, 1922.

2 SHEETSSHEET 1.

MCWLW/ I (if/A Auk. ATTOR/V V G. HILL ELECTRICAL CONDENSER.

APPLICATION FILED JULY23, 1919.

1,408,738. Pa ented Mar- 7 22.

2 SHEETS-SHE INVENTOR JMQM LW @MEY UNITED sures PATENT OFFICE.

our man, or wasmeron, ms'rmc'r or GOLUIBIA, assIoNoa or ONE-EAL! r0 LOUIS srmmwna, or BROOKLYN, NEW You.

ELECTRICAL CONDENSER.

' Application filed July 28,

To all whom it may concern:

Be it knownthat I, GUY HILL, a citizen of the United States, residing in Washington, District of Columbia, ave invented certain new and useful Im rovements in Electrical Condensers, of whlch the followin is a specification.

This invention relates to an improved construction of insulation for the metallic supporting plates of a condenser. I This construction is applicable either to a variable air condenser or to afixed air condenser and the same rinciples also apply if oil is used instead 0 air between the plates and also if any other dielectric is used.

My invention is particularly valuable when applied to either fixed or variable condensers used in radio telegraph and radio telephone systems, although it is of value for other work.

The main object of the invention is to construct a supporting metallic plate for a condenser having a bushing thereon and 1nsulated therefrom.

Another object of the invention is to construct a novel insulating structure by means of which the bushings in the main supporting plates or discs of the condenser are held to and insulated from the plate by a mold able insulating material, to the end that the plate, bushing and insulation will in effect consist in onemechanical unit and thus a substantial and strong construction for building the condenser is obtained.

Another object of my invention is to provide such a structure consisting of few parts and simple and inexpensive to manufacture.

Another object of my invention is to obviate the mechanical and electrical defects found in prior structures of this character.

Other objects will appear from the subjoined specification and claims.

Referring to the drawings:

Fig. 1 is a plan view of an electrical condenser provided with a supporting plate for the same embodying my invention, the operative half being removed.

Fig. 2 is a section on line 22 of Fig. 1.

Fig. 3 is a section of a fragment of a supporting plate also illustrating my invention.

Fig. 4 is a plan of a supporting-plate further illustrating my invention.

Fig. 5 is a section on line 55 of Fig. 4.

While the illustrations and constructions Specification of Letters Patent.

Patented Mar. '7, 1922. 1019. 'Serial no. 312,724.

shown in the drawing relate more particularly to a variable air condenser, as has been stated above the same rinciples apply to a fixed air condenser and 1f oil is used insteadof air between the plafles, and also when any other dielectric .is use The structure illustrated is a simple form of variable air condenser with my invention embodied therein. It is-therefore only necessary to generally describe the structure of the condenser in order to clearly understand the structure and efficacy of my invention.

Referring .to the drawing, the condenser consists of the upper and lower fixed plates A and B constituting the main supporting plates or discs which are held in place by the metal clamping rods 10 which are here conventionally shown, but may be of any approved construction, the plates being secured to the rods by suitable nuts'll. 12 are the fixed lates in electrical contact with the metal r0 s 10 and 13 are the movable plates in electrical contact with the shaft-20, said plates being properly separated by spacers 14, or any other approved means, not shown, as it does not form a part of this invention. A handle H is secured to the shaft by means of which the shaft may be turned in the bushings acting as bearings.

My invention consists in providing the insulating bushings 30 in the plates A and B within which the shaft 20 is mounted and is adapted to turn. These bushings 30 are insulated from the plates A and B respectively, by a layer of insulation 40, as shown, to secure the bushings 30 in place in the plates A and B. The bushing is first centered in the hole or opening 0 which is made at a suitable point inthe plates A and B respectively. The side of the hole is serrated or roughened in any suitable manner, as at 4:1, and the outer surface of the bushing is serrated or roughened as at 31 so that the insulating material when fixed in place will be more securely held to the plates A and B and to the bushings. After likewise also apply rightly and efi'ectively held in position in the plates A and B, so that there is no possibility of any air space remaining between thewalls of the bushing and plate and the insulation, thus preventing brushing and consequent electrical break down.

The insulating material may be any suitable moldable material, .preferably that known in the art as electrose;

The plates A and B so constructed with insulating bushings are put in position in the condenser, as shown, and the shaft 20 is mounted in the bushings in any approved manner. It will thus be seen that the movable plates 13 are insulated from the fixed plates 12 by the two insulations 30, one in each main plate A and B. A substantial mechanical structure is therefore provided and ample insulation is obtained by the construction above described. a

The size and form of this insulation can be varied as desired.

As illustrated in Fig. 3, the insulation 40 may be provided with an extended surface, thereby increasing the leakage Fath by means of corrugations consisting 0 suitable ribs 50 and grooves 51, as shown. So also may the bushing 30 and insulation 40 extend on either side of the plates A and B as at a and b as illustrated, in order to obtain a larger mechanical bearing, when desired.

In Figs. 4 and 5 I have illustrated a different form of insulated supporting plates A. As shown therein, these plates are provided with a plurality of bushings and in-' sulating connections therefor so that the clamping rods 10 can be insulated from the main supporting plates, and these additional insulations 40' are held in the plate A and to the bushings 30' to secure and hold them in an insulated position in the plate in the same manner as has been previously described.

In the construction shown in Figs. 4 and 5 the outer surface of the bushing and the inner surface of the holes 0 and O are sli htly serrated or roughened so that the mo dable insulating material may obtain a secure hold on the metallic surfaces.

From theabove description it is therefore very clear that the upper and lower main supporting plates embodying my invention constitute a single practically integral mechanical unit and the electrical and mechanical advantages derived 'therefrom are su erior to those which are present in plates w ere the bushingsare not permanently fixed to the insulation and to the plates. It is also apparent that my invention, consisting as it does of few parts, is' simple and inexpensive to manufacture.

As changes of construction could be made within the scope of my invention, it is in.- tended that all matter contained in the insulation ti htly fitting there fitted in the ho e of said plate and of above description or shown in the accompan'ying drawings shall-be interpreted as illustrative and not in a limiting sense.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a device of the kind described, a metallic supporting plate for an electrical condenser having an aperture therein, and a bushing secured to the wall of said aperture by a moldable insulating material.

2. In a device of the kind described, a metallic su porting plate for an electrical condenser aving a hole therethrough, a bushing situated within said hole, and moldable insulating material between the wall of the hole in the plate and the outer wall of the bushing to secure the one to the other.

3. A supporti plate or disc for an electric condenser hav a hole extending therethrough substantial y at the center thereof and a bushin secured to the wall of said hole by a mo dable insulat' material.

4. A supporting plate or me for an electric condenser hav a hole extending therethrou h substantia y at the center thereof, a bu 'ng therein, and a stri of moldable ween to secure the bus ing to the plate.

5. A su porting plate or disc for an electrical con enser, a bush' inserted in a hole throu h the plate and secured thereto by a molda 1e insulating material so compressed as to tightly fit the metallic parts without permitting air cells therebetween.

6. A supporting plate or disc for an electrical condenser provided with a hole extending therethrough, a bushing lining said hole and secured to the plate by compressed moldable insulating material, the jomts between the bushing, the plate and the insulating material being free of air holes or cells.

In a device of the kind described, a supporting metallic plate, a plurality of bushin tightly secured to the plate by moldab e insulating material.

8. In a device of the kind described, a metallic 'supportin plate provided with a hole extendm t erethrough, a bushing greater length than the thickness of the plate, and tightly and uniformly secured to the plate by moldable insulat' material.

9. In a device of t e kind dewribed, a metallic supporting plate provided with a hole extending therethrough, a bushing fitted in the hole of said plate and of greater length than the thickness of the plate, and

tig tly and uniformly secured to the plate by moldable insulating material comp therebetween.

10. In a device of the kind described, a metallic supporting plate, a bush' located in a hole extendingJ through the p ate, and a. strip of molda 1e insulating ma erial tightly fitted between the bushing and the plate, the upper and lower surface of the insulation being grooved to extend the leakagesurface thereof.

11. In a device of the kind described, a

metallic supporting plate, a bushing located- Y Y the bushing and the insulation being greater than the thickness of the plate.

12. In a device of the kind described, a

, metallic supporting plate having a hole therethrough, a bushing located in the said hole and secured to the wall thereof by a compressed body of moldable insulating material, the opposing walls of the bushing of moldable insulating and of the hole being serrated to effectively engage with the moldable insulating material.

13. A supporting structure for. an electrical condenser having a bushing secured thereto by moldable insulating material.

14. In a device of the kind described, a metallic bushing, a met'allicsupport for an electrical condenser and moldable insulating material intimately connecting the one to the other without permitting air cells therebetween.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, cit and State of New York, this 21 day of July, 1919.

GUY HILL.

In'presence of ZITA M. GRAHAM. 

